Kepler mission has made it possible to study the light-curve of more than 195000 targets. The initial purpose of this mission was to detect the earth like planets in the habitable zone of stars [1]}, [2]}. However, its long duration and continuous observations, along with high precision photometry, provides the possibility of studying the magnetic and flare activity for a large sample of stars [3]}, [4]}, [5]}, [6]}, [7]}, [8]}. Analyzing the observations of a large number of stars with the same instrumental setup, data reduction and observing techniques decreases the random errors and increases the robustness of the results [9]}; this is one of the great benefits of the data provided by the Kepler mission.
